JPH0465106A - Composite part - Google Patents

Abstract

PURPOSE:To prevent giving adverse effect on a ceramic sintering material provided at the lower area of an insulating layer at the time of trimming electronic part element layer with a laser beam and reduce heating of composite parts with laser beam and variation of characteristics resulting from successive cooling process by forming the electronic part element layer on the insulating layer. CONSTITUTION:A ceramic green sheet printing conductive paste at the upper surface and a plain ceramic green sheet are laminated and thereby these are integrally baked to form a sintered layers 12 to form internal electrodes 13a to 13d. Next, an insulating layer 20 is formed on the upper surface of the sintered layer 12. A pair of connecting conductive layers 21a, 21b are formed to reach a region of the predetermined width (a) from the insulating layer 20. A resistance material 22 is formed by the baking between the connecting conductive layers 21a, 21b. Finally, external electrodes 23a, 23b are respectively attached to the end surfaces 12a, 12b of the sintered layer 12. Even when the electronic part element layer is trimmed with a laser beam, the lower ceramic sintering material is not varied in the property. Therefore, a composite part having the required characteristic can be formed with high accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite component formed by combining and integrating electronic component elements such as a resistor and inductance with a multilayer capacitor.

[Prior Art] FIG. 2 shows a cross-sectional view of an example of a conventional composite component. In a composite component 1, a plurality of internal electrodes 3a to 3d form a ceramic layer in a ceramic sintered body 2 made of dielectric ceramic. They are arranged so that they overlap with each other. Internal electrode 3a
~3d are a pair of end faces 2a and 2b of the ceramic sintered body 2
They are drawn out alternately to form a multilayer capacitor element. Note that 4a and 4b indicate external electrodes. A connecting conductive layer 5a5b connected to the external electrodes 4a and 4b is formed on the upper surface of the ceramic sintered body 2, and a resistance paste is printed and baked between the connecting conductive layers 5a and 5b. A body 6 is formed.

Therefore, the composite component 1 has a circuit configuration in which a capacitor and a resistor are connected in parallel between the external electrodes 4a and 4b.

By the way, in order to accurately set the resistance value of the resistor 6 to a desired value, it is necessary to trim the resistor paste after printing and baking. This trimming is usually performed using laser light.

However, when trimming is performed with a laser beam, not only the resistor 6 but also the ceramic sintered body portion below the resistor 6 is heated, and its quality tends to change due to the thermal cycle of heating and subsequent cooling. there were.

As a result, not only is it impossible to obtain a desired resistance value, but there is also a risk that the characteristics of the composite component as a whole may vary.

Therefore, as shown in FIG. 3, an insulating layer N7 that is not altered by laser light is formed on the upper surface of the ceramic sintered body 2.
A connecting conductive layer 5a is provided on the insulating layer 7.

A structure in which a resistor 5b and a resistor 6 are formed has been proposed. This insulating layer 7 is formed by applying a paste containing an insulating material that is not altered by laser light over the entire area between the end faces 2a and 2b.

[Problem to be solved by the invention]

However, since the insulating layer 7 is formed as described above, both ends 7a and 7b of the insulating layer 7 sometimes hang down onto the end surfaces 2a and 2b of the sintered body 2. As a result, as shown in FIG. 3, poor connection may occur between the external electrodes 4a, 4b provided on the end surfaces 2a, 2b and the connection conductive layers 5a, 5b.

Therefore, an object of the present invention is to provide a method in which, when trimming an electronic component element layer formed on the surface of a ceramic sintered body, deterioration of the ceramic is difficult to occur, and the reliability of the connection between the external electrode and the connecting conductive layer is excellent. The object of the present invention is to provide a composite part having a structure that is unique to the user.

[Means to solve the problem]

In the composite component of the present invention, a plurality of internal electrodes are arranged in a ceramic sintered body so as to overlap with each other via a dielectric layer, and are alternately drawn out to a pair of end faces of the ceramic sintered body to form a multilayer capacitor element. is configured. An insulating layer is formed on at least one outer surface of the outer surfaces connecting the pair of end surfaces of the ceramic sintered body, with a region of a predetermined width separated from the pair of end surfaces. An electronic component element layer is formed on this insulating layer, and is electrically connected to both ends of the electronic component element layer, and extends over a region of a predetermined width on the outer surface of the sintered body. A pair of connection conductive layers are formed on the surface. Further, a pair of external electrodes are formed on the pair of end faces of the ceramic and sintered body so as to be electrically connected to the internal electrodes and the connection conductive layer drawn out to the end face of the sintered body.

[Effect]

Since the electronic component element layer is formed on the insulating layer, even if the electronic component element layer is trimmed with laser light, it will not have an adverse effect on the ceramic sintered body that exists below the insulating layer. Fluctuations in characteristics caused by heating and subsequent cooling of parts can be reduced.

Further, the insulating layer is formed on the outer surface of the ceramic sintered body with a region of a predetermined width separated from the end surface, and the connecting conductive layer is formed so as to extend over the region of the predetermined width. Therefore, the external electrode provided on the end face and the connection conductive layer can be reliably electrically connected.

[Explanation of Examples]

FIG. 1 is a sectional view of a composite component according to an embodiment of the present invention. The composite component 11 is constructed using a rectangular ceramic sintered body 12 made of dielectric ceramic.

That is, inside the ceramic sintered body 12, a plurality of internal electrodes 13a to 13d are arranged so as to overlap with each other via the dielectric ceramic layer, and the ceramic sintered body 12
are drawn out alternately to a pair of end faces 12a, 12b,
This constitutes a multilayer capacitor unit.

As shown in FIG. 4, the multilayer capacitor unit has a conductive paste 15 on the top surface for forming internal electrodes.
15 is printed on the ceramic green sheet 16, and i
A plurality of ceramic green sheets 18 with Jt paste 17.17 printed on the top surface are alternately laminated, and one or more ceramic green sheets 19 without conductive paste printed on the top layer are placed on the bottom layer as required. It is obtained by laminating one or more ceramic green sheets to which no paste is applied, pressing them together in the thickness direction, and then firing them together. That is, although it is not clear in FIG. 1, two multilayer capacitor units are arranged in the direction from the front of the paper to the back of the paper in FIG.

Returning to FIG. 1, an insulating layer 20 is formed on the upper surface of the ceramic sintered body 12. The insulating layer 20 is formed by printing and baking an insulating material that is not altered by laser light, such as a paste mainly composed of lead borosilicate. This insulating layer 20 is formed with a predetermined width a apart from the end surfaces 12a and 12b. The predetermined width a is usually selected to be 0.1 to 0.5 mm.

Further, on the upper surface of the ceramic sintered body 12, the end surface 12
Connecting conductive layers 21a and 21b are formed to extend inward from the a and 12b sides, respectively. Connection conductive layer 2
1a and 21b are provided for electrically connecting an external electrode and an electronic component element layer, which will be described later,
It is formed so as to reach the area of the predetermined width a.

The connecting conductive layers 21a and 21b are formed by applying a conductive paste and baking after obtaining the ceramic sintered body 12.
Alternatively, a conductive paste for configuring the connection conductive layers 21a and 21b is applied to the upper surface of the ceramic green sheet 19 described above, and is integrally fired with the ceramic sintered body 12 in a firing process to obtain the ceramic sintered body 12. It may also be formed by

A resistor 22 as an electronic component element layer is formed so as to be electrically connected between the connection conductive layers 21a and 21b. The resistor 22 is formed by printing and baking a paste mainly made of a resistive material. This resistor 2
2 is formed to a size included in the upper region of the insulating layer 20, as is clear from FIG. This is to prevent the effect of laser light from reaching the ceramic sintered body 12 when adjusting the resistance value by trimming with laser light.

23a and 23b indicate external electrodes, a pair of end surfaces 12a,
12b, and the connection conductive layer 21
a, 21b are also electrically connected.

As is clear from FIG. 1, in the composite component 11 of this embodiment, the insulating layer 20 is formed on the end surface 12a, leaving a region of a predetermined width a.
, 12b, and connection conductive layers 21a and 21b are formed so as to extend over the region of a predetermined width. Therefore, the external electrodes 23a, 23b can be reliably connected to the connection conductive layers 21a, 21b.

Next, an example of a method for manufacturing the composite component 11 of the above embodiment will be described.

As explained with reference to FIG. 4, the conductive paste 15,
A ceramic sintered body 12 can be obtained by stacking a plurality of ceramic green sheets 16, 18 with numbers 15, 17, and 17 printed on their upper surfaces and a plain ceramic green sheet 19 and firing them together. The obtained ceramic sintered body 12 is shown in a perspective view in FIG. By this sintering, the conductive pastes 15, 15, 17, and 17 are baked, and as shown in FIG. 6, internal electrodes 13a to 13d are formed.

Next, an insulating layer 20 is formed on the upper surface of the ceramic sintered body 12. The insulating layer 20 may be formed above each of the two multilayer capacitor units, or one large area insulating layer 20 may be formed to span the upper region of the two multilayer capacitor units. Good too. Insulating layer 20
is formed, for example, by printing and baking a paste mainly composed of lead borosilicate.

Next, as shown in FIG. 8, a pair of connecting conductive layers 21 are formed so as to extend from above the insulating layer 20 to above the above-mentioned area of the predetermined width a.
a, 21b are formed. The connection conductive layers 21a and 21b are
It is formed by applying a conductive paste and baking it. Further, the connection conductive layers 21a and 21b are formed in each of the two all-in-one capacitor units 7) described above.

Next, as shown in FIG. 9, a connecting conductive layer 21a is formed.

The resistor 22 is formed by printing and baking a paste mainly made of a resistive material so as to be connected between the resistors 21b and 21b. This resistor 22 is also formed between a pair of connecting conductive layers 21a and 2Ib in each multilayer capacitor unit.

Finally, external electrodes 23a and 23b are formed on the end faces 12a and 12b of the sintered body 12, respectively, by a known electrode forming method. Note that a pair of these external electrodes 23a and 23b are also formed in each multilayer capacitor unit, and furthermore, in each composite component unit. Therefore, in this embodiment, one ceramic sintered body 12 is used to construct two composite parts having the specific structure of the present invention.

The resistance value of the resistor 22 is adjusted by, for example, measuring the resistance value of the resistor 22 and performing trimming by irradiating laser light from above. In this case, since the insulating layer 20 is made of a material that does not change in quality due to laser light, the ceramic or resintered body 12 below does not change in quality.

Note that the insulating layer 20 does not necessarily need to be made of a material that itself does not change in quality due to laser light as in the above embodiments. In other words, even if the insulating layer 20 itself changes in quality, it does not affect the sintered body below. Any material that does not affect the properties of the entire component can be used as the material constituting the insulating layer in the present invention.

In the above embodiment, a capacitor/resistance composite component using the resistor 22 as the electronic component element layer has been described, but what is formed on the surface of the ceramic sintered body is not limited to a resistor. For example, it may be another electronic component element layer such as an inductor, and similar to the resistance value of a resistor, the characteristics of each electronic component element layer can be adjusted by trimming with a laser beam.

〔Effect of the invention〕

According to the present invention, the insulating layer is formed on the outer surface of the sintered body with a predetermined width of W between the pair of end faces, and the insulating layer is formed on the outer surface of the sintered body with a predetermined width of W, and the connection conductive layer extends over the predetermined width of the region. layers are formed. Therefore, when forming the insulating layer, the insulating layer does not sag onto the end face of the sintered body, so that the electrical connection between the connecting conductive layer and the external electrode can be ensured.

Moreover, since the electronic component element layer is formed on the insulating layer, even if the electronic component element layer is trimmed with laser light, there is no risk that the ceramic sintered body below will be altered by the laser light.

Therefore, it becomes possible to form a composite part having desired characteristics with high precision.

Therefore, according to the present invention, it is possible to provide a composite component with stable characteristics and excellent reliability.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a composite part according to an embodiment of the present invention;
Fig. 2 is a cross-sectional view showing an example of a conventional composite part, Fig. 3 is a cross-sectional view showing another example of a conventional composite part, and Fig. 4 is a ceramic green sheet used in manufacturing an embodiment of the present invention. and an exploded perspective view for explaining the printed shape of the conductive paste formed thereon, FIG. 5 is a perspective view showing the ceramic sintered body, and FIG. 6 is a sectional view taken along the line ■-■ in FIG. 5. ,
FIG. 7 is a sectional view showing a state in which an insulating layer is formed, FIG. 8 is a sectional view showing a state in which a connecting conductive layer is formed, and FIG. 9 is a sectional view showing a state in which a resistor is formed. In the figure, 11 is a composite component, 12 is a ceramic sintered body, 12a and 12b are end faces, 13a to 13d are internal electrodes, 20 is an insulating layer, 21a and 21b are connecting conductive layers, and 22 is a resistor as an electronic component element layer. The bodies 23a and 23b indicate external electrodes.

Claims (1)

[Claims] (1) A ceramic sintered body having a structure in which a plurality of internal electrodes are arranged so as to overlap in the thickness direction with dielectric ceramic layers interposed therebetween, and are drawn out alternately on a pair of end faces, and the ceramic sintered body an insulating layer formed on at least one outer surface of the outer surfaces connecting the pair of end faces with a predetermined width area between the pair of end faces; and electrons formed on the insulating layer. a pair of connecting conductors formed to be electrically connected to both ends of the component element layer and the electronic component element layer, respectively, and to extend over the region of the predetermined width on the outer surface of the ceramic sintered body; A composite component, comprising: a layer; and a pair of external electrodes formed on a pair of end surfaces of the sintered body so as to be electrically connected to the internal electrode and the connecting conductive layer.